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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1ea55ce7f8b92a94d7d1fdef584d907bca13eea5978a65e2ff2c6ffbb421fb' 
  AND token = '1KNbJrgz8N57kI6HtD1zhE4xhU/x81Oz6G9pmXUaVow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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