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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc95750e47ea28e7c80e64fdfc5acd36fd0e1eb5c078c68160865782f293f795' 
  AND token = 'pqYmb09xz3YKoasgtZNd3LLfBHwwe0a4RmOd7rfx5M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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