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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6228c490262a1baf94464055ae5774b5d2ea3de24b9282d213cd6f2f4c5a0b68' 
  AND token = '8ucBXUbqMnxctyE80qr9gZcoYSiULzcZPpHJKbLlLo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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