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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281c30898d6f8d6a68b06a8b7d42a4d2cfacbbf0ef5828f16c3fe2c9c1f3cbf9' 
  AND token = 'W0LKBWMD9OGS9nERhzI9x0K+edJ/Gqnv2XdfyIcEsO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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