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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63d125a4b17328cfecee31ec6a9b03becc2dfd802c56b4a0e02818cdd915c7c' 
  AND token = 'UWjEdU5AKTlj7pFTe3RzTJNExphmRw3G0h7Zfd66j5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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