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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a22b9ab6539ed00aa537874479b59acddf35b0a62e0ae7cefe58eeb67cb1f20' 
  AND token = 'Cj5nMDiZH8e9S95MhPEWRPOObu59VA632NbMsfIi54s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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