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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dea1cdf451e75681fef5b70517b651185095c5f54081fd3ed15655d69df2d4' 
  AND token = 'Mrgb2tmIV+rUk8SzdcxI/5Ctl1j5wi71LxsMSBLKXSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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