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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abe63603f942a87537cb2f679a25a238253e6c8a51e0143b71f8fdbe7e5c773' 
  AND token = 'nQf22vSncRQDABRu9QGnanPbNQGvVIGBJZG/zTo66oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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