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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1be96f9139f5ed0ea341009da0199b361cbcad46ae8cddffcf1e81e97718f7c' 
  AND token = '5Lqb2zdkrUTfoeS5BfhVGy2D+ofC9jUFdW3yuugP+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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