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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c92bc9703e3bf1f9a4a0457a50433ffa78f97788d33fe69081678eccbe0e67' 
  AND token = 'Q112LtUI4HMc5KqxsiKbjTbF1A3Bxs85KWBQpMMJO10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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