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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac967933869a891f00de6c21b971f8c79173c3950c1541bace05ffa9aca5d309' 
  AND token = 'XZKbeZMekN1axrKeI9QxJUVelmZqS7A6LaXnQQdkez4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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