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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea18a6d3d4dcaafff24f74e725356b9f36a57a90bf4417f3fa6d226a00846423' 
  AND token = 'ujrOwon3ChgHv4WbDgy7UfLXSZf5VmyjyUOHwJmpZQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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