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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d3f0b3d74b2b138e333e8f06f3a313efd59e5c3483b721bb718e9c0e319f4a' 
  AND token = 'ea1l4EGhg61JzBkGUDSt8l1xDdwSYT3w/Kiwzd76RIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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