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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eade841c240b661a53c75dcfdb699f3b2d8dd563a119dbb0b6ed29b002dd389' 
  AND token = 'TvKCu/u1BQbEmV/YzRozmunBa+ojcmyRDwJj1RySS10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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