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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22539c536c7eb5209f976b1b574f68bbd44ca1956891e16f63c613af36e798de' 
  AND token = 'pe9pirQc+iLT1NV8FV5sGurnNKFDgpHmhPeGAMVJ6v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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