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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd0a4dd533e071535f75537be01bc85bab6fb98b2cbcd11a222b67909a2d187' 
  AND token = 've2KUDl1Fft7asZlLm32PWb/xgq+ICcFNU0s+G33Uyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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