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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211b793619fc02053cce29fe505ee7f4456c06be116217e47221164f32dbb19b' 
  AND token = 'onjCSTDClPL+dKG87Dq2iSKqnhNf9k/mFagNb8YZedo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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