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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab2a130e557cc1637a64f6538a5a3cc4be95d023d39628e63998c64a3588c6c' 
  AND token = 'PPML8leqywCyAXLhikP+yfII8HLKj66QjHLiio84+qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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