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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213b5c5c9b92f0b69726327ef328788714f52676a9639edbbb81780dbbca8ad4' 
  AND token = 'rG7/JCnPl1U59xDm2x3KoxWPq6xdaOozolpLcNgug7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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