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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41495ebb8f7d3ade7dc1d5d279b92bc3dd342e81dbd2decf1afe9659977fc9fc' 
  AND token = 'gSVhugafRkpXcFhTXr4mGswq6FuZrITtTM7MtxNB87A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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