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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807ffc4b9a6632358c39e3f44286f7829953335a986e3d8a7072419fa7694a72' 
  AND token = 'nMl8PrSC8fw0fIntWGDvRZynvwiU3cDqi6/Robes4UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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