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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab06a0a622e9370ecfcc72b82dd59ebbc4ee03a3d305a5a799f9efa87377a39c' 
  AND token = 'nMPWGhqKgpBM68nxxc2ACmhMwNGWhEoAWr8y67FqXLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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