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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64738c30ec92361e3eac050d7e18bd48845b2294937296a2941274381095c19' 
  AND token = 'Uz9kXsw8vpCBt2aRo36ftyJqa5Po13gKkJ3YQGdHP4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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