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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696ba659789fdb8e17d3aa93604b2d6a1cda05f697e2e501d73a8227fae6e576' 
  AND token = 'BfFP4TlKC04ZfOBF18MsqvIlwdeO7kZ4n3gpS0tZ/4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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