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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c97e4922be212453f726e8fafc71214214777625e3136ac434745e4ea8202a' 
  AND token = 'j+Z0oxeSTToQlw3CVhb6B1dg44cO4dInySEGd6PHM80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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