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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134e81b4aec70c7b7598f307c54b370d3e9276a4b7c6d62ab424eec52c3a3d8e' 
  AND token = 'S0LoC3137zm07IQ2fHCKIsCSl+NyzRyxKbZEU51CRjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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