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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818c9329895758ca4b94a12a86f4312145dd9db60ccb0dc3481767c7c1308943' 
  AND token = 'HOK67XA7tj4dOBbl+EGfYxuYU3ITAE6j59WRTTs/xF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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