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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72aee8cb0a345de34f2d5c17719013c64dbfa4425e022bef3c2764301efe0e3' 
  AND token = '1OxVLUwYoCD8tF5QQ4D9nUkW4s4xY3Q7lGojtik68N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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