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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519caff1e0607d6fe66683205884c54294eea90d9b856d42b5ce2ddefece90e9' 
  AND token = '+/k5R5dYt6VwpMvRcuZCAvhvSjOeD1RzsgyFoU2Mvmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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