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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b165d3102dd34699f95a0569dee262fa5dc453a6b6c4a2d6e651397134307' 
  AND token = 'KO6Ikmww7QJMP68fRmrxQ51ILHsLmGDInL3nE7o24Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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