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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7143d14bd486e48a0a318f4e7ea72f0a6a6131ea8d5cf652ee6d69e74bcef52' 
  AND token = 'iInzpHtK6T8oPneUEGi2DwdmpSQPV/BsUsc8g3SyPrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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