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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29687e5bffd6db64e7b0446ef072a194f5b2cb9dfa83a7a22ac74ed85ea02a8a' 
  AND token = 's4RNGj/8GkWPWfKJ4jfalNOLHaw2O4uQZxrS28Hl3KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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