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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf3805756030a1fcc5f585762cbb61c74347c95efba7afa1732b0a9ec75d60a' 
  AND token = 'mI1eYSvlKIJjZINTWdDi856TP0W/KM1e8UlYAd+b0oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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