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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7ac4aef7d4c87cfbc91382725c537725cb8ea865a21593db940f57b9904e56' 
  AND token = 'owuYPWPzgiT4ibBK3E1yLfFGiwo+M7ya/Ov7stHYWD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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