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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27188dd3fe7428475fd01ae6d255da264f4c095326e7f5863e6b62c70b74ae6' 
  AND token = '/rW5eAJk7SKT632K82sBi/JeM+Nz0ioTTlW92Mc8baM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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