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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4128665a2c78487bf9a519154457d82aa8db36d1346a56d49a6b48d066e525' 
  AND token = '2r8+epP3DqlJsI0DacbwW0uYil+rLEA81hfbehHkBtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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