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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8af23ddf773d77fc95b985cb31e479c993c4626218f406ced58291410fd4535' 
  AND token = 'DIT4e5lyOcs+gwwtBFleHB0tujahyaRD4+ub4+EG3Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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