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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c16961d5213f4c235936e92734e47c5bfd22c3aa448b70a643ab762b2899baf' 
  AND token = '/NUph3jBrcMb5a8s/VlJUGV/xCuj0g8xAeam69EB+rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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