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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ebba1b680f335a21a62d4adc62a21bec57e4bff9ee6a499e7a7cd1e4abc4c7' 
  AND token = 's7sKp1PKvMNz9gNIBsm++8yXk9UeV1d7gL96Kgjg9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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