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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07748524ae0d6213c20b890fa18e0807ec4fc579f6c4c82b3ad300d249c3b0b2' 
  AND token = 'YexqJNY8lOGYjHkRr++BQlpSEridfXB5Xpzltig7RpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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