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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfda745024d91b27131fe5219ae2ad38dafdca032f998efb6c611f139f55cf8' 
  AND token = 'KZvPANStXB70hYLShVCCnlfxF+m5X/7B2tiotJ9cMac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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