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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4801ba7000d6b5e8e1d4807e6ccf01f838c89486f7090cc41db32ce1ed690fb5' 
  AND token = 'veczGijKQh67t44CiZ1lQHwrlgQ3y+OuoRjoUAnFtkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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