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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e8d20fda9d2f72a8b18cfb0dcac10566db74cd21998b7cfda2295f0f1b142d' 
  AND token = 'cpRCuWgcal//qGQTPowihm3UKJ5OU6Oe8tkGOYWdD14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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