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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cc7b4e58d1bba51437da48f5ae6a8c02c98b112484ce355ea7ae97f78761b4' 
  AND token = 'kKNE6LH9NXqqEKxT1k9WyAq1OzQkZ+Svv/t32sembVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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