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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a86d1ece1f3ce583623e962b6cfae625f641390b58e46029d7f03ec4719bce2' 
  AND token = 'qzjxMo7kA+7WSxC+ZxQTNooqBZv9Dsxg8N3ihOsCnyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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