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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02cc71a45d44ff65541de57b0b895bbf8f07ef92b669ff183bbf25aaf921a65' 
  AND token = '7rthq2WR5+EkFECQUaQZes7wPFqLBcG5spcaQhLe+qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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