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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102e6cd327a19debf2b1dc93ce3f71abf50cd07e2255728b4fb554be41e55487' 
  AND token = 'P9UcNpKRwlD0CJyAbKyOrnbbeRkadMkO4L523x5k4Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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