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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26929914b98a5ac4e33d90a456892a5164484dc9ce772991090ae3d68f80d341' 
  AND token = '2TerSADqTbBecs8Vq4X1gzl4coycr7DHfC1KLGE8AQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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