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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99d60794b8056c52b9cecf10df448bad8f9cb10919bb9b4e165b80df74c4213' 
  AND token = 'rzjNQVUExL2mM5CW/WP+uYd3RI1AjEizGY9ugygJe1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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