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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ba522d12a33a65591167227fba9db2ef6816f079f1ec371740200149c7b2de' 
  AND token = 'YE6E5PnTgnbaDI+ItO09qj0SVf2EplqB2gZLHYm1MiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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