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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779d9a33e7823ef93e49eab99fbc5e6f60c0a50c23f5bba510707c4ae70f0776' 
  AND token = 'u26oSxHPMQxP0xbynGwH0u5Y5i3Wk47tloimwN3Gg8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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