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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee518884754909f53421af413154ab5594cdd8563b865598d0d4de994d37858c' 
  AND token = 'zwkm3YvlMAui7/sHZwU2UKmOeQwXJPmfA86f6zeGxR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}