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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e573503dede13200f5ddb3db3087dda43e96a4f1505f18ebc8d7de870dc003' 
  AND token = 'Wixv3DrpZlLR/m73N4jkyq7EIlqA1xoYZGLeMknEP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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