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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492fb4793700c4e8163840c759be262a45420bf77e31f408da9093e90ac9ad3e' 
  AND token = 'LObETa4b7FgDb03HyoG9ICsqwl59C7bt+T3ShsTmzvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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