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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b0e17910d12173e7bdd56c4fb7c4639337b2cbeefe96ab3749afcee96289d' 
  AND token = '6D188Cnq4XSkORKWo3c3gRHZaxUiaRXuME8Csa26SGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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