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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a5566f7894c1372753ea73e17ffdfecf61a114818b42d1f9629e01cb5e8e61' 
  AND token = 'RzkWHh2+9/0+31QRHA4qbUtxlhuuL8qyUiavJggv81g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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