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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df37d5b7379ab345de849d5f316265154cc40a2ae50b04e9b71fb7a35fb1d60f' 
  AND token = 'z1ULo1+/R/L+pWQlLSpdR5+n8/Ui1pTNWXZYbJCnLS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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