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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccbaccd3cebc0ee2371d60fee55b991ad89adfeabe5e5fa2f2e91c8fff863d2' 
  AND token = 'nMG5Rr4+N37Pmhdt1iFdJNdDsuFP24FjJDFeo80BNtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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